linux-kernel - Re: [PATCH 0/3] drm: tinydrm driver for adafruit PiTFT 3.5" touchscreen

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Date:   Thu, 25 Oct 2018 09:29:35 -0700
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org,
        Noralf Trønnes <noralf@...nnes.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Heiner Kallweit <hkallweit1@...il.com>
Subject: Re: [PATCH 0/3] drm: tinydrm driver for adafruit PiTFT 3.5" touchscreen

Eric Anholt <eric@...olt.net> writes:

> I was going to start working on making the vc4 driver work with
> tinydrm panels, but it turned out tinydrm didn't have the panel I had
> previously bought.  So, last night I ported the fbtft staging
> driver over to DRM.
>
> It seems to work (with DT at
> https://github.com/anholt/linux/commits/drm-misc-next-hx8357d) --
> fbdev works great including rotated, and so does modetest.  However,
> when X11 comes up at 16bpp, I get:
>
> https://photos.app.goo.gl/8tuhzPFFoDGamEfk8
>
> If I have tinydrm set a preferred bpp of 24, X looks great.  Noralf,
> any ideas?

Also, with these patches and the format modifier patch I just sent, mesa
with vc4 is now working with this driver on this branch:

https://gitlab.freedesktop.org/anholt/mesa/commits/kmsro

Now I wonder how we can improve performance of the SPI updates.

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